// JavaScript Document

/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=2000;
var maxYear=2050;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(objField){
	var dtStr = objField.value;
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	if (strYear.length == 2){
		strYear = '20' + strYear;
	}
	strYr=strYear
	
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	
	if (dtStr == "") { 
		objField.value = "";
		return true;
	}

	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm/dd/yyyy")
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false;
	}
	if (strYr.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid year.")// between "+minYear+" and "+maxYear)
		return false
	}

	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false;
	}
return true
}

function clearDateField(passedDate) {
	if (passedDate.value == "mm/dd/yyyy") {
	    passedDate.value = "";
	}
}
function formatFullYearDate(passedDate) {

	var month = passedDate.getMonth() + 1;
	var day = passedDate.getDate();
	var yearUnformatted = passedDate.getFullYear();
	var year;
	
	if (isNaN(yearUnformatted)) {
		yearUnformatted = "";
	}
	if (yearUnformatted < 2000) {
		year=parseInt(yearUnformatted)
		year = year + 100;
	}else{
		year = yearUnformatted;
	}

	var formatFullYearDate = month + "/" + day + "/" + year;
	return formatFullYearDate;
}

function checkDate(objField){
	// Dont validate an empty toDate field.
	if ((objField.name == "toDate") && ( (objField.value == "") || (objField.value == "mm/dd/yyyy"))){
		return true;
	}

	if (!isDate(objField)) {
		objField.focus();
		return false;
	} 

	if (objField.value == "") {
		return true;
	} else {
	 	var objDate = new Date (objField.value);
		objField.value = formatFullYearDate(objDate);
		return true;
	}
}
function checkForm(form){
	if ( !checkDate(form.fromDate) || !checkDate(form.toDate) ) {
		return false;
	}

	if (form.toDate.value == "mm/dd/yyyy"){
		form.toDate.value = "";
	}
	return true;
}
function getTodayDate() {
	var currentDate = new Date();
	today = formatFullYearDate(currentDate);
	return today;
}

/* 
function ValidateForm(){
	var dt=document.frmSample.txtDate
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
 }
*/